The letters are in support of the construction of the Dakota Access Pipeline.

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Workers said during a news conference Monday morning that they want the jobs that the project will create. Laborers' International Union of North America members and leaders took part in the event.

The pipeline would run from the Bakken oil fields in North Dakota, through South Dakota and through 18 Iowa counties on its way to Illinois. A Texas-based company wants to transport half a million barrels of crude oil a day through the pipeline.

Nineteen groups have banded together to fight the pipeline, calling themselves Bakken Pipeline Resistance Coalition. The group is composed of landowners, interest groups and non-profits.

Do you support the pipeline project? Add your comments in the box below or on the KCCI Facebook page.